Investigations on fluid transport properties in the North-German Rotliegend tight gas sandstones and applications

Tight gas reservoirs are an important part of the world gas resources. Such reservoirs have very low permeability (usually below 0.1 mD) and show a strong stress sensitivity to fluid transport properties and a considerable productivity decline during the production process due to increasing effective stress. In an experimental study, several measurement series were performed on plugs from the North-German Rotliegend tight gas reservoirs to improve knowledge and understanding of the effects of changing stress and pore pressure conditions on reservoir rocks, during gas production. In addition to the experimental study, an Interactive Rock Data Catalog (IRDC) has been developed, which contains a database coupled with a correlation module. The database contains metadata of the fields and wellbores included in the IRDC, the corresponding log data and petrophysical data. The correlation module contains correlations derived both from the study measurements and from literature. The results of this study will enable reservoir engineers to select specific data from the database and process it in the correlation module to generate secondary sets of data, which can then be used for modeling and simulation of tight gas reservoirs.